The concept this summer was that Marotta was in charge of buying and Ausilio "in charge" of selling.
They sort of clashed from what I hear because Marotta pretty much ordered him to sell Bastoni, eventually we shifted to the Ausilio mode only to have that blocked and returned to trying to sell Skriniar instead. So Ausilio wasn't left to make whatever move was needed to sell De Vrij, Dumfries and whomever else was needed to be sold in order to finance the moves that Marotta wanted to get done; Bremer and Dybala. Getting Lukaku destroyed whatever strategy we had laid out and Ausilio got on board with the need to sell a big name in order to proceed with the rest of the moves.
So Ausilio isn't really in charge, he just gets to run the errands that Marotta assigns him to run, but truth is that Inzaghi also played a part in the mercato by blocking several exits mostly, like Dumfries at one point, as well as expressing disappointment that Skriniar and Bastoni were about to be sold by the management.
Ausilio has a great eye for talent and is very well connected in Italy and arguably well connected in Europe. He'd be useful to have around but he's not your main guy. He's a football guy, he's not a negotiator or a man manager, at least not inherently. Not sure if he can pull that off, but it's possible. It's a role he didn't have but apparently fans believe he has.
People say that Mourinho is outdated from modern football and has lost his touch, but I think that's more applicable to Marotta who's a dinosaur in the sport. He doesn't understand that players have the power now and he's no longer at Juventus with all rivals killed off by FIGC or by seppuku, with infinite funds coming in and everyone in Italy saying yes to him.
We need someone who's more in touch with modern football in that role. I'd give the job to an ex-player and iirc we had a deal with Bocconi in the last 20 years or so, so a lot of our former players have Business Administration/Management/Economics/Sports Management degrees. I'd give Ivan Cordoba a chance for example, seems to have the personality and the academic background to support this role. And loves Inter.